Çift Ağlı Hidrojellerin Basma Yükü Altında Gerilme Gevşemesi Davranışı

Akrilamid (AAM) zayıf mekanik özellikleri dolayı, biyodoku iskeleleri ve yumuşak doku aktüatörleri gibi biyomedikal uygulamalarda istenilen özellikleri sergileyememektedir. Bu nedenle Aljinat (ALG) kullanılarak çift ağa sahip hidrojel şeklinde kullanılmaktadır. Bu çalışmada AAM-ALG hidrojelindeki kovalent çapraz bağlayıcı (BIS) ve iyonik çapraz bağlayıcı (CaCl2) miktarının mekanik özellikler etkisini araştırmak üzere beş farklı hidrojel üretilmiştir. Silindirik basma numuneleri %20 gerinim seviyesine kadar yüklenmiş, daha sonra 300 saniye süre ile gevşeme testi yapılmıştır. Sonuçlar iyonik çarpaz bağlayıcı miktarının mekanik özelliklere etkisinin çok güçlü olduğunu göstermiştir. Kovalent çapraz bağlayıcı miktarının ise belli bir kritik seviyenin üzerinde etkili olduğu gözlemlenmiştir.

Anahtar Kelimeler:

Çift ağlı hidrojel, poliakrilamid, aljinat, mekanik özellikler

Stress Relaxation Behavior of Double Network Hydrogels under Compressive Loading

Because of moderate stretchable properties of acrylamide (AAM), it is used as double network hydrogel with alginates (AAL). We prepared AAM-ALG hydrogels containing various amount of crosslinker (BIS) and concentration of calcium chloride (CaCl2) solution. A series of uniaxial compression loading tests were performed on five different AAM-ALG specimens. The specimens are loaded up to 20% strain and hold at the same strain level for 300 seconds. Concentration of CaCl2 solution dependency is clear; increasing molarity of CaCl2 yields an increase in the stress level. On the other hand, effect of amount of BIS is not dominant on mechanical properties.

Keywords:

Double network hydrogel, polyacrylamide, alginate,

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